(echoing what nat said)

I've just been re-reading through DANDR again and saw that Dr. Atkins' states that there is absolutely no research to suggest that taking in large amounts of protein will damage your kidneys. According to him, that is a misunderstanding based upon the fact that people with kidney problems have problems metabolizing protein. So doctors have spread the fallacy that because people with poor kidney function cannot metabolize protein, therefore large quanities of protein must cause kidney problems!

Just drink your water to make sure everything runs smoothly and you'll be fine.